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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // const version = '1.0.0'
        // version = '2.0.0'

        const user = {
            name: '仙女',
            age: 18,
        }
        // user = {}
        user.name = '神仙'
        user.age = 19
        console.log(user)
    </script>
</body>
</html>